Applanation Tonometry

Tonometry is a diagnostic test that measures the pressure inside your eye which is otherwise called intraocular pressure. This test can help an eye specialist to determine whether or not you are under the risk of glaucoma. Glaucoma is a disease in which the intraocular pressure inside the eye increases that it can damage your optic nerve. This is one of the leading cause of blindness among people.

In most of the patients with glaucoma, the fluid that normally is present in the eye consumes slowly diminishes causing the pressure to build up inside the eye. Without treatment, it can cause permanent blindness of the person. So tonometry test is critical for detecting eye changes at the early stages.

Tonometry is an eye test that can detect changes in eye pressure long before the patients is aware of them.

Who needs a Tonometry test?

This test will be conducted by the eye specialist if he thinks you are at the risk of developing the disease called glaucoma. You may also be at higher risk if you have the following:

  • You are at the age over 60 years
  • Have family history of glaucoma
  • have diabetes
  • have hyperthyroidism
  • have some chronic eye condition or injuries
  • you have nearsightedness
  • you have used corticosteroid medication for a prolonged period of time
  • if you have peripheral vision loss gradually
  • tunnel vision
  • severe eye pain
  • blurred vision
  • halos around eyes
  • reddening around your eyes

All the above are the signs of glaucoma.

The doctor in the beginning of the test will put the numbing eye drops so that you do not feel any touching sensation in your eye. The doctor may touch a tiny, thin strip of paper that contains an orange dye to the surface of your eye to stain it. This helps to increase the accuracy of the test.The doctor then uses slit lamp. You have to rest your chin and forehead on the support provided and the tonometer probe will just touch your cornea. The instrument can detect the pressure of the eye by putting little pressure on your cornea. The tension is adjusted by a doctor until he gets the proper reading.

You will not feel any pain as your eyes are numb. Tonometry is an extremely safe procedure, with minimal risk that the cornea might get scratched which normally gets healed by itself.